🚀 go-pugleaf

In article <879275926snz129.os2.7@nospam.demon.co.uk>
           {R}reply@nospam.demon.co.uk "Richard Ashton" writes:

-> The ringing current is presented on the A leg, travels through the
-> capacitor and out on the third wire, along this third wire all the
-> bells of an extension set are wired in series, until the last
-> extension when the "out" side of the bell is connected to the B leg.

Ahem .... not any more, it isn't. Since the new-style plugs were
introduced in the early 1980's or thereabouts, the bells are
high-impedance and wired in parallel. The old hard-wired (or jack plug)
system had parallel speech circuits and series bells, hence the
complicated wiring (which is why phone cable is four-core).

-> if the A and B are crossed over the "out" side could be back to the A
-> leg, hence no ringing :)

That's true. But the phone woldn't work either as the line wold be
shorted out.

-> I can get even more complicated with party lines or DACS, if you wish.

Re there any party lines still in use? I thought they had all been
converted to exclusive long ago. Don't know DACS, what's that?

rgds
LAurence